﻿			* {
			    margin: 0;
			    padding: 0;
			}
			
			.pptbox {
			    width: 400px;
			    height: 100px;
			    position: relative;
			    overflow: hidden;
			}
			
			.pptbox .innerwrapper {
			    width: 2400px;
			    /*当增加了li之后，大盒子的宽度也要相应的增加 这里增加了两个li，每个400，所以ul 从原来的1600变成了2400*/
			    height: 100px;
			    list-style: none;
			    position: absolute;
			    left: -400px;
			}
			
			.innerwrapper li {
			    width: 400px;
			    height: 100px;
			    float: left;
			}
			
			.innerwrapper li a {
			    display: block;
			}
			
			.innerwrapper li a img {
			    width: 400px;
			    height: 100px;
			    display: block;
			}
			
			.btnleft {
			    width: 20px;
			    height: 50px;
			    position: absolute;
			    left: 0;
			    top: 25px;
			    background-color: black;
			    background-image: url(../imgs/img//arrow-left.png);
			    background-position: center center;
			    background-repeat: no-repeat;
			    cursor: pointer;
			    z-index: 100;
			    color: #fff;
			}
			
			.btnright {
			    width: 20px;
			    height: 50px;
			    position: absolute;
			    right: 0;
			    top: 25px;
			    background-color: black;
			    background-image: url(../imgs/img//arrow-right.png);
			    background-position: center center;
			    background-repeat: no-repeat;
			    cursor: pointer;
			    z-index: 100;
			    color: #fff;
			}
			/*控制按钮开始*/
			
			.controls {
			    width: 96px;
			    position: absolute;
			    left: 152px;
			    bottom: 10px;
			    list-style: none;
			}
			
			.controls li {
			    width: 20px;
			    height: 20px;
			    background-color: gold;
			    float: left;
			    margin-right: 2px;
			    text-align: center;
			    border-radius: 10px;
			    cursor: pointer;
			}
			
			.controls li.current {
			    background-color: aqua;
			    color: brown;
			}
			/*控制按钮结束*/